翻訳と辞書
Words near each other
・ Angus Campbell
・ Angus Campbell (general)
・ Angus Campbell (psychologist)
・ Angus Campbell-Gray, 22nd Lord Gray
・ Angus Carmichael
・ Angus cattle
・ Angus Charles Graham
・ Angus Chisholm
・ Angus Clark
・ Angus Claude Macdonell
・ Angus Cobblestone Farmhouse and Barn Complex
・ Angus College
・ Angus Cooper
・ Angus Cottrell
・ Angus Council election, 2007
Angular aperture
・ Angular artery
・ Angular bone
・ Angular bundle
・ Angular cheilitis
・ Angular defect
・ Angular diameter
・ Angular diameter distance
・ Angular displacement
・ Angular distance
・ Angular eccentricity
・ Angular frequency
・ Angular gyrus
・ Angular hocicudo
・ Angular house


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Angular aperture : ウィキペディア英語版
Angular aperture

The angular aperture of a lens is the apparent angle of the lens aperture as seen from the focal point:
:a = 2 \arctan \left( \frac \right) = 2 \arctan \left( \frac \right)
where
:f is the focal length
:D is the diameter of the aperture.
== Relation to numerical aperture ==

In a medium with an index of refraction close to 1, such as air, the angular aperture is approximately equal to twice the numerical aperture of the lens.
Formally, the numerical aperture in air is:
:\mathrm = \sin a/2 = \sin \arctan \left( \frac \right)
In the paraxial approximation, with a small aperture, D:
:\mathrm \approx a/2

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Angular aperture」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.